Date: Sun, 11 Feb 2024 10:58:56 -0800 From: Mark Millard <marklmi@yahoo.com> To: Mario Marietto <marietto2008@gmail.com> Cc: freebsd-arm <freebsd-arm@freebsd.org>, FreeBSD Mailing List <freebsd-questions@freebsd.org>, freebsd-hackers <freebsd-hackers@freebsd.org>, FreeBSD Current <freebsd-current@freebsd.org>, Warner Losh <imp@bsdimp.com> Subject: Re: How to use the L4 Microkernel with a FreeBSD userland. Message-ID: <071E080E-C0E6-40F0-A0DF-4FCC22FC004D@yahoo.com> In-Reply-To: <CA%2B1FSijq0ez9%2BJXCSJP2rfWUXLjcTaEPJo-3NcO5Vu3H26L=hg@mail.gmail.com> References: <CA%2B1FSijq0ez9%2BJXCSJP2rfWUXLjcTaEPJo-3NcO5Vu3H26L=hg@mail.gmail.com>
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On Feb 11, 2024, at 05:44, Mario Marietto <marietto2008@gmail.com> = wrote: > I'm trying to understand how to use the L4 Microkernel with a FreeBSD = userland. I've asked the same to a L4 developer,but he told me that he = does not know FreeBSD,so I'm here to ask the same question. First of all = I'm sure that it can be done,because it is written clearly on their = website : >=20 >=20 > http://os.inf.tu-dresden.de/L4Re/download/snapshots/ >=20 >=20 > on the section : > Host system requirements > The host system shall be a 64bit-based system with a recent Linux = distribution installed and at least 2GB of free disk space. > All necessary tools required by the build are available from the = provided packages of the Linux distributions, including cross compilers. = But there are also other cross compiler packages available (see below). = You might want to run make check_build_tools in the src/l4 directory to = verify the common tools are installed. > You are free to use any Linux distribution you like, or even BSDs or = any of its derivatives. But then you should know the game. Especially = tool versions should be recent, as installed on the listed distributions = below. > We are confident that the snapshot works on the following = distributions: > =E2=80=A2 Debian 11 or later > =E2=80=A2 Ubuntu 22.04 or later >=20 > Let's say I want to use the L4 microkernel + FreeBSD 14 on my = Raspberry Pi 4,the first step I did was to build L4Re for the = Rpi,according with this instructions : >=20 >=20 > http://os.inf.tu-dresden.de/L4Re/rpi.html=20 >=20 > This is the log file of the compilation,that hasn't given any error : >=20 >=20 > https://pastebin.ubuntu.com/p/6SwN2mpJBM/ >=20 >=20 > Or I could have taken a pre built image of the L4 microkernel here :=20= >=20 >=20 > http://os.inf.tu-dresden.de/download/snapshots/pre-built-images/arm64/ >=20 >=20 >=20 > At this point the tutorial says that I should use a Linux distro. They = suggest the official distro for the Raspberry Pi 4,that's RaspBian. But = I don't want to use Linux as a userland,I want to use FreeBSD. The = question now is : what should I do to achieve that goal ? How can I link = the L4 microkernel with the ubldr bootloader of FreeBSD ? Or should I = link it to the kernel of FreeBSD ? Can someone explain to me the missing = step ? thanks. QUOTING the "Configuring yourself" section: The make setup step configures predefined setups for both the L4Re = microkernel (Fiasco) and the L4Re user-level software, and connects both = together so the images for the target system can be built. END QUOTE So L4Re has its own user-level software, not just a kernel. There is no = use of a Linux or FreeBSD user-level software when L4Re is booted. (They are just used for building.) "The host system" is just a host for building the L4Re parts and = assembling the image from the parts. The "Pulling it together" section = is about combining the parts (including the microkernel and the = user-level software) to make the overall image that does not include = Linux or FreeBSD code. =3D=3D=3D Mark Millard marklmi at yahoo.com
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